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5.1: History of Life

Difficulty Level: At Grade Created by: CK-12
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Vocabulary

TermDefinition
absolute dating Carbon-14 or other method of dating fossils that gives an approximate age in years.
fossil Preserved remains or traces of an organism that lived in the past.
fossil record The record of life as told by the study and analysis of fossils.
geologic time scale A division of Earth's history into blocks of time based on major events in geology, climate, and the evolution of life.
molecular clock Using DNA (or proteins) to estimate relatedness among species; approximates the time that related species diverged from a common ancestor.
relative dating Method of dating fossils by their location in rock layers; determines which fossils are older or younger but not their age in years.

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Difficulty Level:
At Grade
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Date Created:
Feb 24, 2012
Last Modified:
Sep 04, 2016
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SCI.BIO.411.L.1